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D( x )
5*a^5*b^3 = 0
5*a^5*b^3 = 0
5*a^5*b^3 = 0
5*a^5*b^3 = 0
x należy do R
x belongs to the empty set
(5*a^6*b^2-(15*a^3*b^5))/(5*a^5*b^3) = 0
x belongs to the empty set
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